Mixed signal system-on-a-chip integrated simultaneous multiple sample/hold circuits and embedded analog comparators

Abstract

An integrated circuit includes a plurality of circuit groups, each circuit group containing a plurality of analog inputs, a buffer, a sample/hold circuit and a comparator. Each buffer has an input to which any of the analog inputs in its group may be programmably connected. The output of each buffer is coupled to the input of the sample/hold circuit in the group. The output of each sample/hold circuit is coupled to one input of a multiplexer. The output of the multiplexer is coupled to the input of an amplifier having programmable gain and programmable offset. The comparator in each group has inputs that may be programmably coupled to at least one analog input in the group or to a reference voltage source.

1. An integrated circuit including:
 a plurality of circuit groups, each circuit group containing a plurality of analog inputs, a plurality of programmable analog switches, a buffer, and a sample/hold circuit, the buffer having at least one input to which any of the analog inputs in its group may be programmably connected by selectively programming the programmable analog switches, each buffer having an output coupled to an input of the sample/hold circuit in the group; 
 a multiplexer having a plurality of inputs, each input coupled to an output of a different one of the sample/hold circuits; 
 an amplifier having an input coupled to an output of the multiplexer. 
 
     
     
       2. The integrated circuit of  claim 1  wherein the amplifier has programmable gain. 
     
     
       3. The integrated circuit of  claim 1  wherein the amplifier has programmable offset. 
     
     
       4. The integrated circuit of  claim 1  wherein each circuit group further includes a comparator having inputs that may be programmably coupled to at least one analog input in the group. 
     
     
       5. The integrated circuit of  claim 4 , wherein at least one of the inputs of each comparator may be programmable coupled to coupled to a reference voltage source.